diff options
Diffstat (limited to 'doc/context/sources/general/manuals/metafun/metafun-text.tex')
| -rw-r--r-- | doc/context/sources/general/manuals/metafun/metafun-text.tex | 96 |
1 files changed, 45 insertions, 51 deletions
diff --git a/doc/context/sources/general/manuals/metafun/metafun-text.tex b/doc/context/sources/general/manuals/metafun/metafun-text.tex index f70f53ac3..4442894cb 100644 --- a/doc/context/sources/general/manuals/metafun/metafun-text.tex +++ b/doc/context/sources/general/manuals/metafun/metafun-text.tex @@ -974,11 +974,8 @@ define an offset too. \startbuffer \startuseMPgraphic{text vars} - baselineskip := 8pt ; - strutheight := (7.2/10) * baselineskip ; - strutdepth := (2.8/10) * baselineskip ; - offset := baselineskip/2 ; - topskip := strutheight ; + MyOffset := LineHeight/2 ; + MyTopSkip := StrutHeight ; \stopuseMPgraphic \stopbuffer @@ -999,8 +996,8 @@ dimensions. hsize := xpart lrcorner p - xpart llcorner p ; vsize := ypart urcorner p - ypart lrcorner p ; - q := p xscaled ((hsize-2offset)/hsize) - yscaled ((vsize-2offset)/vsize) ; + q := p xscaled ((hsize-2MyOffset)/hsize) + yscaled ((vsize-2MyOffset)/vsize) ; hsize := xpart lrcorner q - xpart llcorner q ; vsize := ypart urcorner q - ypart lrcorner q ; @@ -1061,7 +1058,7 @@ Then we use \type {\useMPgraphic{text}} to call up the picture. The offset is not optimal. Note the funny gap at the top. We could try to fix this, but there is a better way to optimize both paths. -We lower the top edge of \type {q}'s bounding box by \type {topskip}, then cut +We lower the top edge of \type {q}'s bounding box by \type {MyTopSkip}, then cut any part of the left and right pieces of \type {q} that lie above it. Similarly, we raise the bottom edge and cut off the pieces that fall below this line. @@ -1069,8 +1066,8 @@ we raise the bottom edge and cut off the pieces that fall below this line. \startuseMPgraphic{text cutoff} path tt, bb ; - tt := (ulcorner q -- urcorner q) shifted (0,-topskip) ; - bb := (llcorner q -- lrcorner q) shifted (0,strutdepth) ; + tt := (ulcorner q -- urcorner q) shifted (0,-MyTopSkip) ; + bb := (llcorner q -- lrcorner q) shifted (0,StrutDepth) ; l := l cutbefore (l intersectionpoint tt) ; l := l cutafter (l intersectionpoint bb) ; @@ -1120,18 +1117,18 @@ line has a height and depth, we have to determine which part touches first. \startuseMPgraphic{text calc} vardef found_point (expr lin, pat, sig) = pair a, b ; - a := pat intersection_point (lin shifted (0,strutheight)) ; + a := pat intersection_point (lin shifted (0,StrutHeight)) ; if intersection_found : - a := a shifted (0,-strutheight) ; + a := a shifted (0,-StrutHeight) ; else : a := pat intersection_point lin ; fi ; - b := pat intersection_point (lin shifted (0,-strutdepth)) ; + b := pat intersection_point (lin shifted (0,-StrutDepth)) ; if intersection_found : if sig : - if xpart b > xpart a : a := b shifted (0,strutdepth) fi ; + if xpart b > xpart a : a := b shifted (0,StrutDepth) fi ; else : - if xpart b < xpart a : a := b shifted (0,strutdepth) fi ; + if xpart b < xpart a : a := b shifted (0,StrutDepth) fi ; fi ; fi ; a @@ -1153,7 +1150,7 @@ subpath). \startuseMPgraphic{text step} path line; pair lll, rrr ; - for i=topskip step baselineskip until vsize : + for i=MyTopSkip step LineHeight until vsize : line := (ulcorner q -- urcorner q) shifted (0,-i) ; @@ -1165,17 +1162,17 @@ subpath). \typebuffer \getbuffer Here we divide the available space in lines. The first line starts at \type -{strutheight} from the top. +{StrutHeight} from the top. We can now finish our graphic by visualizing the lines. Both the height and depth of the lines are shown. \startbuffer \startuseMPgraphic{text line} - fill (lll--rrr--rrr shifted (0,strutheight)--lll - shifted (0,strutheight)--cycle) withcolor .5white ; - fill (lll--rrr--rrr shifted (0,-strutdepth)--lll - shifted (0,-strutdepth)--cycle) withcolor .7white ; + fill (lll--rrr--rrr shifted (0,StrutHeight)--lll + shifted (0,StrutHeight)--cycle) withcolor .5white ; + fill (lll--rrr--rrr shifted (0,-StrutDepth)--lll + shifted (0,-StrutDepth)--cycle) withcolor .7white ; draw lll withpen pencircle scaled 2pt ; draw rrr withpen pencircle scaled 2pt ; draw (lll--rrr) withpen pencircle scaled .5pt ; @@ -1214,13 +1211,13 @@ we get better results when we (on purpose) take a smaller height. \startuseMPgraphic{text step} path line; pair lll, rrr ; numeric vvsize ; - if (strutheight+strutdepth<baselineskip) : + if (StrutHeight+StrutDepth<LineHeight) : vvsize := vsize ; else : - vvsize := (vsize div baselineskip) * baselineskip ; + vvsize := (vsize div LineHeight) * LineHeight ; fi ; - for i=topskip step baselineskip until vvsize : + for i=MyTopSkip step LineHeight until vvsize : line := (ulcorner q -- urcorner q) shifted (0,-i) ; @@ -1240,11 +1237,8 @@ better) results. \startbuffer \startuseMPgraphic{text vars} -baselineskip := 8pt ; -strutheight := 4pt ; -strutdepth := 2pt ; -offset := 4pt ; -topskip := 3pt ; +MyOffset := .5LineHeight ; +MyTopSkip := StrutHeight ; \stopuseMPgraphic \stopbuffer @@ -1261,8 +1255,8 @@ this is to let \METAPOST\ write a \type {\parshape} specification. \startbuffer \startuseMPgraphic{text macro} - def provide_parshape (expr p, offset, baselineskip, - strutheight, strutdepth, topskip) = + def provide_parshape (expr p, MyOffset, LineHeight, + StrutHeight, StrutDepth, MyTopSkip) = \includeMPgraphic{text move} \includeMPgraphic{text split} @@ -1285,13 +1279,13 @@ the loop we write those values to a file using another loop. \startuseMPgraphic{text loop} path line; pair lll, rrr ; numeric vvsize, n ; n := 0 ; - if (strutheight+strutdepth<baselineskip) : + if (StrutHeight+StrutDepth<LineHeight) : vvsize := vsize ; else : - vvsize := (vsize div baselineskip) * baselineskip ; + vvsize := (vsize div LineHeight) * LineHeight ; fi ; - for i=topskip step baselineskip until vvsize : + for i=MyTopSkip step LineHeight until vvsize : line := (ulcorner q -- urcorner q) shifted (0,-i) ; @@ -1327,12 +1321,12 @@ We can call this macro using the part we used in the previous examples. path p ; p := ((0,1)..(-1,0)..(1,0)--cycle) scaled 65pt ; provide_parshape - (p, % shape path - .5*\baselinedistance, % offset - \baselinedistance, % distance between lines - \strutheight, % height of a line - \strutdepth, % depth of a line - \strutheight) ; % height of first line + (p, % shape path + .5*LineHeight, % offset + LineHeight, % distance between lines + StrutHeight, % height of a line + StrutDepth, % depth of a line + StrutHeight) ; % height of first line \stopuseMPgraphic \stopbuffer @@ -1405,7 +1399,7 @@ happens in border cases. For instance, too small first lines are ignored. First we define a circle. Watch how the dimensions are set in the graphic. The arguments passed to \type {build_parshape} are: path, an offset, an additional horizontal and vertical displacement, the baseline distance, the height and depth -of the line, and the height of the first line (topskip in \TEX\ terminology). The +of the line, and the height of the first line (MyTopSkip in \TEX\ terminology). The height and depth of a line are often called strut height and depth, with a strut being an invisible character with maximum dimensions. @@ -1413,8 +1407,8 @@ being an invisible character with maximum dimensions. \startuseMPgraphic{test 1} path p ; p := fullcircle scaled 6cm ; - build_parshape(p,6pt,0,0,\baselinedistance, - \strutheight,\strutdepth,\strutheight) ; + build_parshape(p,6pt,0,0,LineHeight, + StrutHeight,StrutDepth,StrutHeight) ; draw p withpen pencircle scaled 1pt ; \stopuseMPgraphic @@ -1429,8 +1423,8 @@ suits the small lines at the top and bottom. \startuseMPgraphic{test 2} path p ; p := fullsquare rotated 45 scaled 5cm ; - build_parshape(p,6pt,0,0,\baselinedistance, - \strutheight,\strutdepth,\strutheight) ; + build_parshape(p,6pt,0,0,LineHeight, + StrutHeight,StrutDepth,StrutHeight) ; draw p withpen pencircle scaled 1pt ; \stopuseMPgraphic @@ -1447,8 +1441,8 @@ always trivial. path p ; p := (.5w,h) -- (0,h) -- (0,0) -- (w,0) & (w,0) .. (.75w,.5h) .. (w,h) & (w,h) -- cycle ; - build_parshape(p,6pt,0,0,\baselinedistance, - \strutheight,\strutdepth,\strutheight) ; + build_parshape(p,6pt,0,0,LineHeight, + StrutHeight,StrutDepth,StrutHeight) ; draw p withpen pencircle scaled 1pt ; \stopuseMPgraphic @@ -1472,8 +1466,8 @@ needed, since we need these later on. w := h := 6cm ; o := 6pt ; path p ; p := shape ; w := h := 6cm ; o := 0pt ; path q ; q := shape ; - build_parshape(p,q,6pt,6pt,\baselinedistance, - \strutheight,\strutdepth,\strutheight) ; + build_parshape(p,q,6pt,6pt,LineHeight, + StrutHeight,StrutDepth,StrutHeight) ; draw q withpen pencircle scaled 1pt ; \stopuseMPgraphic @@ -1591,8 +1585,8 @@ define a quote typeset in a circular paragraph shape. \startbuffer[shape] \startuseMPgraphic{center} - build_parshape(fullcircle scaled 8cm,0,0,0,\baselinedistance, - \strutheight,\strutdepth,\strutheight) ; + build_parshape(fullcircle scaled 8cm,0,0,0,LineHeight, + StrutHeight,StrutDepth,StrutHeight) ; \stopuseMPgraphic \startshapetext[center] |